Modelling circumbinary gas flows in close T Tauri binaries star

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de Val-Borro, M. (författare)

Modelling circumbinary gas flows in close T Tauri binaries star

Artikel/kapitelEngelska2011

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2011-03-21
Oxford University Press (OUP),2011
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Nummerbeteckningar

LIBRIS-ID:oai:DiVA.org:uu-154893
https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-154893URI
https://doi.org/10.1111/j.1365-2966.2011.18339.xDOI
https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-67855URI

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Språk:engelska
Sammanfattning på:engelska

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Ämneskategori:art swepub-publicationtype

Anmärkningar

authorCount :4
Young close binaries open central gaps in the surrounding circumbinary accretion disc, but the stellar components may still gain mass from gas crossing through the gap. It is not well understood how this process operates and how the stellar components are affected by such inflows. Our main goal is to investigate how gas accretion takes place and evolves in close T Tauri binary systems. In particular, we model the accretion flows around two close T Tauri binaries, V4046 Sgr and DQ Tau, both showing periodic changes in emission lines, although their orbital characteristics are very different. In order to derive the density and velocity maps of the circumbinary material, we employ two-dimensional hydrodynamic simulations with a locally isothermal equation of state. The flow patterns become quasi-stable after a few orbits in the frame corotating with the system. Gas flows across the circumbinary gap through the corotating Lagrangian points, and local circumstellar discs develop around both components. Spiral density patterns develop in the circumbinary disc that transport angular momentum efficiently. Mass is preferentially channelled towards the primary and its circumstellar disc is more massive than the disc around the secondary. We also compare the derived density distribution to observed line profile variability. The line profile variability tracing the gas flows in the central cavity shows clear similarities with the corresponding observed line profile variability in V4046 Sgr, but only when the local circumstellar disc emission was excluded. Closer to the stars normal magnetospheric accretion may dominate, while further out the dynamic accretion process outlined here dominates. Periodic changes in the accretion rates on to the stars can explain the outbursts of line emission observed in eccentric systems such as DQ Tau.

Ämnesord och genrebeteckningar

NATURVETENSKAP Fysik hsv//swe
NATURAL SCIENCES Physical Sciences hsv//eng
NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
accretion
accretion discs
hydrodynamics
binaries: close
stars: individual: DQ Tau
stars: individual: V4046 Sgr
stars: pre-main-sequence
Physics
Fysik

Biuppslag (personer, institutioner, konferenser, titlar ...)

Gahm, Gösta F.Stockholms universitet,Institutionen för astronomi(Swepub:su)gahm (författare)
Stempels, Henricus C.Uppsala universitet,Observationell astrofysik(Swepub:uu)ericstem (författare)
Peplinski, A.Stockholms universitet,Institutionen för astronomi (författare)
Stockholms universitetInstitutionen för astronomi (creator_code:org_t)

Sammanhörande titlar

Ingår i:Monthly notices of the Royal Astronomical Society: Oxford University Press (OUP)413:4, s. 2679-26880035-87111365-2966

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Av författaren/redakt...: de Val-Borro, M.; Gahm, Gösta F.; Stempels, Henric ...; Peplinski, A.

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NATURVETENSKAP: NATURVETENSKAP; och Fysik

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Av lärosätet: Uppsala universitet; Stockholms universitet

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